We are the only supplier to manufacture our desiccant foil-packed in Mylar bags, meaning they have no shelf life.  Most other desiccant you get arrives already spent, and you should be reheating it to reactivate it.  In the standard plastic packing most desiccant come in, it can be expire within 3 months of the manufacturer shipping it.  Often, it takes 6-8 weeks just for desiccant to reach the United States.

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